Corneal topographer based on the Hartmann test | 合法醫療器材資訊網

由YMejía著作·2009·被引用17次—OurresultsarecomparedwiththoseobtainedwithaPlacidoringtopographer(TomeyTMS-4videokeratoscope),andweshowthatourcurvaturemapsaresimilar ...

Purpose: The purpose of this article is to show the performance of a topographer based on the Hartmann test for convex surfaces of F/# approximately 1. This topographer, called "Hartmann Test topographer (HT topographer)," is a prototype developed in the Physics Department of the Universidad Nacional de Colombia.

Methods: From the Hartmann pattern generated by the surface under test, and by the Fourier analysis and the optical aberration theory we obtain the sagitta (elevation map) of the surface. Then, taking the first and the second derivatives of the sagitta in the radial direction we obtain the meridional curvature map. The method is illustrated with an example.

Results: To check the performance of the HT topographer a toric surface, a revolution aspherical surface, and two human corneas were measured. Our results are compared with those obtained with a Placido ring topographer ...